Verify that an association is established between two objects

Summary

I want to verify that an association is established between two objects when i click “save and close”

Content

I want to verify that an  association is established between two objects when i click “save and close”.

If the two objects not exist an association, the system will not allow the workspace to be closed.  But now the code does't work.

private void _recordContext_Closing(object sender, System.ComponentModel.CancelEventArgs e)
{
       _recordContext.RefreshWorkspace();
      IOrganization _org = _recordContext.GetWorkspaceRecord(RightNow.AddIns.Common.WorkspaceRecordType.Organization) as IOrganization;
            if (_org != null && _org.ID >= 0)
            {

                //through webservice to query whether the association is exis
                if (queryOrganizationEntityCount(_org.ID) <= 0)